Xwater-tube b boiler



Oct. 22,` 1929. VA. c. bANKS Re. 17,464

NNNNNN OR I\ H ALFARED CT nANKs OF Reissued Oct. 22, 1929 I Re. 17,464

AT N FF CE CLEVELAND, orno, 'AssIGNoR or cnn-Earn 'ro JAn'rIN, OF MONTGLAIR, NEW JERSEY m'NGsLEY I..

WATER-T'UBE BOIL'EB. i\

" r igina1 No. 1,707,627, dated April 2, 1929,"Seria1 No. 161,532, filed' January 17, 1927. Applicationfor I r reissue filed August 3, 1929. Serial No. 383395.` 7

The invention -relates to water tube boiler `constructions, particularly to the vertical type employing an upper drum and a bottom` drum With a plurality of sets of tubes (preferably three) extending from the bottom drum to the upper drum. `The invention has to do with the bafile arrangement, and in,- volves a radical departure from the established practice in boilers of this type. Heretofore, it has been customary to arrange the battles so that the gases of combustion, in

and between the banks of tubes, travel longiu tudinally thereof, making relatively sharp bends adjacent the ends of the tube banks. In the present Construction, the bafiles are so arranged that the gases of combustion crossthe various banks of tubes at substantially right anglesthereto. The arrangement also results in an increase in the area of the available heating surface in the first and second passes, where the temperatures are' higher, thus increasing the heat absorbing capacity of the apparatus, and reducing the stack temperatures. One embodment of the invention is` llustrated in the accompanying drawing, wherein: i i

The figureis a vertical'section through a water tube boiler constructed in accordance` suitable gas burners, directed through the 2 openings ands7,but it will be understood that the boiler may be provided with the' usual hand fired grates, or With an automatic"` stoker, for may be fired` by ,any other ap proved method. Following the usual practice, the side of the. Construction on which the,

' gasesfirst pass the tubes, will be referred to as the front side, and the other side (left) on which the outlet flue 8 is located, Will be referred to as the rear side, the banks or sets of tubes being correspondingly ,designated The flow of the gases of combustion across the banks of tubes 3', 4 and 5 is governed and*` directed by an pai r ofbaflles, whichconstitute an important feature' of the invention. The

right hand bafile is madeup of two sections, the lower section 9 extendinglongitudinally of the tubes' 3, While the upper section 10 eX- tends transversely of the tubes 3, 4 and 5, so that the gases of combustion sweep across, the upper portions of all three banks of tubes before they flow downwardly and to the front.

The second battle 11 extends inward from the rear wall 12 of the setting across the tubes 5 and 4, so that the gases of combustion' are caused to sweep across the tubes 5 and 4 and into thetubesof the set 3, after' which they pass forwardly and downwardly across the lower portions of the tubes 4 and 5` to the first to ase to correspondtb" shrlnkagez'ofthe jgases cooling\a tubes in the middle bank 4 aredivided bythe two bafllesinto 'three `'sections increasing in length from the bottom section up, The net cross sectional 'areas of th' passe's, as com area, -1s such` that `properdraft s'finsuredy i\ pared with thedanper The dvantages ncident to' the baffie 'arrangement haveiben' already* set forth, heretofore, and :include improved draft; Con`di`-" v tions 'and increased'heat absorbing (jualities, `so that the arrangement*materally'mcreases therating of boilers to which they are applied; The bends atj the ends ofthe passes are also mOregraduaL'and there are no con'-` tractons crosssectonalarea In' the various passes to a 'p'ont below that of the darnper or {luca-rea, orandead spaces in which gases are not in motion, so that ,the draft 'conditions are favorabl eg The availableheating surface in the first' and second pases, where' the' temperatures are highest ;is relativelylrge as compared with previous arrangement, which increases the i heat absorbing Capacity of the boiler and `gives lower 'stackjtemperatures The gradually decreased cro'ssectional area 9 of 'the "conduit or pass ageway ;for "the j gaes of combust10n also results in* rmprotred-*f'ejconomy`{ of" operaton for the reason' heretofore lecton of soot, which are not readily accessible, and the battle cost is far below that incident to baflles of the usual type as employed in boilers of the character specified. The location of the battle section 9 in the bank of tubes 3 involves an advantage, as the portions of the tubes to the right ofthe section, are thus eXposed to and receive the full benea fit of the radant or reflected heat from the opposite wall 13 of the combustion chamber, while the tubes to the left of this section 9 which are too far in to receive any substantial benefit from the reflected heat from the wall 13, are exposed to, and given the benefit of, the heated gases of combustion as they sweep along and across the tubes in making the turn.

hat I claim is:

1. In combination in a boiler of the vertical type, having a lower drum and an upper drum arranged in substantially Vertical alinement one above the other and three sets or banks of water tubes extending upward from the lower drun to the upper drum, a fire box, an outlet flue at the rear of the boiler at the lower portion thereof, a baflle e-Xtending from the lower drum longitudnally of the tubes of the front bank for a portion of their length and then transversely of such tubes and across the middle bank of tubes and across the space between the middle and rear banks of tubes and terminating short of the rear side of the rear banks of tubes, and a second bafie extending inward from the vertical rear wall of the boiler setting across the rear bank of tubes and into the middle bank of tubes and spaced below the transverse portion of the first battle; i i 2. In combination in a boiler of the Verti-` cal type, having a lower drum and an upper drum arranged in substantially vertical alinement'one above the other, and three sets or 'banks of water 'tubes extendng upward rrom the lower drum to theupper drum, a-

fire box, an outlet fiue at the rear of the boiler at the'lower portion'thereof a battle extending from the lower drun longitudinally of the tubes-of the frontibank for a portion of their length and then transversely of such of sets or banks of water tubes extending upward from the lower drum to the upper drum and including a front bank and a rear bank, a fire box, an outlet fiue at the rear of the boiler at the *lower portion thereof, a baflle extending longitudinally of the tubes of the front bank for a portion or" their length and then transversely of such tubes and into the rear bank, but terminating short of the rear side of such rear bank, and a second haflle extending inward from the vertical rear Wall of the boiler setting across the rear bank of tubes andspaced below the transverse portion of the first battle and terminating short of the front bank of tubes.

In testimony whereof, I have hereunto subscribcd my name this 23rd day of July, 1929.

ALFRED C. DANKS.

tubes and across the middle' bank of tubes and across the' space between the middle and rear banks of tuhes and terminatin'g short of therear sideof the rear'banks' of tubes,

and a' second bafile extending inward from' the vertical rear wall of the boiler setting across the rear bank and into the middle bank of tubes and spaced below the transverse portion of the first baflle, the portion of the first baflle whiolrextends longitudinally of the front bank of tubes being located between the rear tube of such bank and the front tube thereof. I

. 3. In combination in aiboiler of the vertical type having a lower drum and an upper drum arranged in substantially vertical alinement oneabove the other and a plurality 

